Device for the extrusion of web-shaped or belt-shaped preforms from thermoplastic plastic, and method for the extrusion of such a preform

A technology of thermoplastics, preforms, in the field of devices extruding sheet or strip preforms from thermoplastics and extruding such preforms, capable of solving variability limitations, lack of flexibility of adjustment rods, production Limitation and other issues, to achieve the effect of size reduction and considerable material saving

Inactive Publication Date: 2010-03-24
KAUTEX TEXTRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the variability of the wall thickness control over the width of the preform is limited with known devices, e.g. the absolute width of the preform cannot be influenced
The production of individual pointed protrusions over the width and length of the planar preforms is also limited, since only limited thickness variations of the preforms are possible due to the lack of flexibility of the adjustment rods

Method used

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  • Device for the extrusion of web-shaped or belt-shaped preforms from thermoplastic plastic, and method for the extrusion of such a preform
  • Device for the extrusion of web-shaped or belt-shaped preforms from thermoplastic plastic, and method for the extrusion of such a preform
  • Device for the extrusion of web-shaped or belt-shaped preforms from thermoplastic plastic, and method for the extrusion of such a preform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] exist figure 1 A part of the method for producing an extrusion-blow molded article from a planar preform 1 is schematically shown in FIG. Each preform 1 is extruded pendulously from two wide-slit nozzles 2 . The slot nozzles 2 are part of an extrusion head, not shown, which is supplied with molten liquid thermoplastic in a known manner from the extruder.

[0037] For example figure 1 As shown, a preform 1 in the form of a web or sheet can be extruded between the open parts of the forming die 3 .

[0038] The molding die 3 includes two outer dies 3a and one middle die 3b. The outer molds 3 a each form a sub-cavity into which the pre-forms 1 are drawn or pressed and which respectively determine the later outer shape of the finished article. The manufacture of the article can take place, for example, by first extruding the individual preforms 1 between the open outer molds 3 a and the middle mold 3 b. The respective outer mold 3a is then closed relative to the central...

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Abstract

The invention relates to a device for the extrusion of web-shaped or belt-shaped preforms (1) made of thermoplastic plastic, having an extrusion head, the melt outlet of which is designed as a nozzleslit which can be adjusted perpendicular to the direction of extrusion and which extends straight. The device is characterized in that the nozzle slit (6) is bounded at least on one side directly by anumber of segments (9) which can be adjusted perpendicular to the direction of extrusion independently of each other, the segments enabling a level-wise or step-wise adjustment of the width of the nozzle slit (6).

Description

technical field [0001] The invention relates to a device for extruding sheet-shaped or strip-shaped preforms from thermoplastics, which has an extrusion head whose melt outlet is designed as a straight line which can be adjusted transversely to the extrusion direction Extended nozzle clearance. [0002] The invention also relates to a method for extruding sheet-shaped or strip-shaped preforms from thermoplastics, preferably using the device. Background technique [0003] A device of the type mentioned at the outset is known, for example, from utility model DE 20 2006 013 751 . Utility model DE 20 2006 013 751 U1 describes a forming tool for producing strip-shaped preforms, which comprises a plurality of channels each having an inlet in the shape of an annular segment and an elongated outlet, wherein each The ring-segment-shaped inlets are arranged distributed over the circumference on a common radius and are separated from one another by radially extending cuts. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/16B29C47/12B29C47/92B29C49/04B29C49/20B29C51/02B29C69/00B29C48/08B29C48/13B29C48/30B29C48/31B29C48/345B29C48/92
CPCB29C2791/006B29C49/0073B29C2947/92628B29C2947/92609B29C51/02B29C2947/92647B29C49/20B29C2049/048B29C47/003B29C47/92B29C2947/92904B29C47/0019B29C47/0021B29C47/165B29C51/12B29C51/267B29C2791/007B29C49/04B29C2049/0057B29C48/92B29C48/07B29C48/08B29C48/12B29C48/313B29C2948/92609B29C2948/92628B29C2948/92647B29C2948/92904B29C48/13B29C49/06914B29C49/04108B29C49/071B29C49/04116
Inventor J·埃克哈特M·弗兰克-迈因茨T·弗罗伊茨海姆G·沃尔特
Owner KAUTEX TEXTRON
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